aboutsummaryrefslogtreecommitdiff
path: root/node_modules/semver/README.md
blob: 2293a14fdc3579558dbe9fbc50aa549657948c3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
semver(1) -- The semantic versioner for npm
===========================================

## Install

```bash
npm install semver
````

## Usage

As a node module:

```js
const semver = require('semver')

semver.valid('1.2.3') // '1.2.3'
semver.valid('a.b.c') // null
semver.clean('  =v1.2.3   ') // '1.2.3'
semver.satisfies('1.2.3', '1.x || >=2.5.0 || 5.0.0 - 7.2.3') // true
semver.gt('1.2.3', '9.8.7') // false
semver.lt('1.2.3', '9.8.7') // true
semver.minVersion('>=1.0.0') // '1.0.0'
semver.valid(semver.coerce('v2')) // '2.0.0'
semver.valid(semver.coerce('42.6.7.9.3-alpha')) // '42.6.7'
```

As a command-line utility:

```
$ semver -h

A JavaScript implementation of the https://semver.org/ specification
Copyright Isaac Z. Schlueter

Usage: semver [options] <version> [<version> [...]]
Prints valid versions sorted by SemVer precedence

Options:
-r --range <range>
        Print versions that match the specified range.

-i --increment [<level>]
        Increment a version by the specified level.  Level can
        be one of: major, minor, patch, premajor, preminor,
        prepatch, or prerelease.  Default level is 'patch'.
        Only one version may be specified.

--preid <identifier>
        Identifier to be used to prefix premajor, preminor,
        prepatch or prerelease version increments.

-l --loose
        Interpret versions and ranges loosely

-p --include-prerelease
        Always include prerelease versions in range matching

-c --coerce
        Coerce a string into SemVer if possible
        (does not imply --loose)

--rtl
        Coerce version strings right to left

--ltr
        Coerce version strings left to right (default)

Program exits successfully if any valid version satisfies
all supplied ranges, and prints all satisfying versions.

If no satisfying versions are found, then exits failure.

Versions are printed in ascending order, so supplying
multiple versions to the utility will just sort them.
```

## Versions

A "version" is described by the `v2.0.0` specification found at
<https://semver.org/>.

A leading `"="` or `"v"` character is stripped off and ignored.

## Ranges

A `version range` is a set of `comparators` which specify versions
that satisfy the range.

A `comparator` is composed of an `operator` and a `version`.  The set
of primitive `operators` is:

* `<` Less than
* `<=` Less than or equal to
* `>` Greater than
* `>=` Greater than or equal to
* `=` Equal.  If no operator is specified, then equality is assumed,
  so this operator is optional, but MAY be included.

For example, the comparator `>=1.2.7` would match the versions
`1.2.7`, `1.2.8`, `2.5.3`, and `1.3.9`, but not the versions `1.2.6`
or `1.1.0`.

Comparators can be joined by whitespace to form a `comparator set`,
which is satisfied by the **intersection** of all of the comparators
it includes.

A range is composed of one or more comparator sets, joined by `||`.  A
version matches a range if and only if every comparator in at least
one of the `||`-separated comparator sets is satisfied by the version.

For example, the range `>=1.2.7 <1.3.0` would match the versions
`1.2.7`, `1.2.8`, and `1.2.99`, but not the versions `1.2.6`, `1.3.0`,
or `1.1.0`.

The range `1.2.7 || >=1.2.9 <2.0.0` would match the versions `1.2.7`,
`1.2.9`, and `1.4.6`, but not the versions `1.2.8` or `2.0.0`.

### Prerelease Tags

If a version has a prerelease tag (for example, `1.2.3-alpha.3`) then
it will only be allowed to satisfy comparator sets if at least one
comparator with the same `[major, minor, patch]` tuple also has a
prerelease tag.

For example, the range `>1.2.3-alpha.3` would be allowed to match the
version `1.2.3-alpha.7`, but it would *not* be satisfied by
`3.4.5-alpha.9`, even though `3.4.5-alpha.9` is technically "greater
than" `1.2.3-alpha.3` according to the SemVer sort rules.  The version
range only accepts prerelease tags on the `1.2.3` version.  The
version `3.4.5` *would* satisfy the range, because it does not have a
prerelease flag, and `3.4.5` is greater than `1.2.3-alpha.7`.

The purpose for this behavior is twofold.  First, prerelease versions
frequently are updated very quickly, and contain many breaking changes
that are (by the author's design) not yet fit for public consumption.
Therefore, by default, they are excluded from range matching
semantics.

Second, a user who has opted into using a prerelease version has
clearly indicated the intent to use *that specific* set of
alpha/beta/rc versions.  By including a prerelease tag in the range,
the user is indicating that they are aware of the risk.  However, it
is still not appropriate to assume that they have opted into taking a
similar risk on the *next* set of prerelease versions.

Note that this behavior can be suppressed (treating all prerelease
versions as if they were normal versions, for the purpose of range
matching) by setting the `includePrerelease` flag on the options
object to any
[functions](https://github.com/npm/node-semver#functions) that do
range matching.

#### Prerelease Identifiers

The method `.inc` takes an additional `identifier` string argument that
will append the value of the string as a prerelease identifier:

```javascript
semver.inc('1.2.3', 'prerelease', 'beta')
// '1.2.4-beta.0'
```

command-line example:

```bash
$ semver 1.2.3 -i prerelease --preid beta
1.2.4-beta.0
```

Which then can be used to increment further:

```bash
$ semver 1.2.4-beta.0 -i prerelease
1.2.4-beta.1
```

### Advanced Range Syntax

Advanced range syntax desugars to primitive comparators in
deterministic ways.

Advanced ranges may be combined in the same way as primitive
comparators using white space or `||`.

#### Hyphen Ranges `X.Y.Z - A.B.C`

Specifies an inclusive set.

* `1.2.3 - 2.3.4` := `>=1.2.3 <=2.3.4`

If a partial version is provided as the first version in the inclusive
range, then the missing pieces are replaced with zeroes.

* `1.2 - 2.3.4` := `>=1.2.0 <=2.3.4`

If a partial version is provided as the second version in the
inclusive range, then all versions that start with the supplied parts
of the tuple are accepted, but nothing that would be greater than the
provided tuple parts.

* `1.2.3 - 2.3` := `>=1.2.3 <2.4.0`
* `1.2.3 - 2` := `>=1.2.3 <3.0.0`

#### X-Ranges `1.2.x` `1.X` `1.2.*` `*`

Any of `X`, `x`, or `*` may be used to "stand in" for one of the
numeric values in the `[major, minor, patch]` tuple.

* `*` := `>=0.0.0` (Any version satisfies)
* `1.x` := `>=1.0.0 <2.0.0` (Matching major version)
* `1.2.x` := `>=1.2.0 <1.3.0` (Matching major and minor versions)

A partial version range is treated as an X-Range, so the special
character is in fact optional.

* `""` (empty string) := `*` := `>=0.0.0`
* `1` := `1.x.x` := `>=1.0.0 <2.0.0`
* `1.2` := `1.2.x` := `>=1.2.0 <1.3.0`

#### Tilde Ranges `~1.2.3` `~1.2` `~1`

Allows patch-level changes if a minor version is specified on the
comparator.  Allows minor-level changes if not.

* `~1.2.3` := `>=1.2.3 <1.(2+1).0` := `>=1.2.3 <1.3.0`
* `~1.2` := `>=1.2.0 <1.(2+1).0` := `>=1.2.0 <1.3.0` (Same as `1.2.x`)
* `~1` := `>=1.0.0 <(1+1).0.0` := `>=1.0.0 <2.0.0` (Same as `1.x`)
* `~0.2.3` := `>=0.2.3 <0.(2+1).0` := `>=0.2.3 <0.3.0`
* `~0.2` := `>=0.2.0 <0.(2+1).0` := `>=0.2.0 <0.3.0` (Same as `0.2.x`)
* `~0` := `>=0.0.0 <(0+1).0.0` := `>=0.0.0 <1.0.0` (Same as `0.x`)
* `~1.2.3-beta.2` := `>=1.2.3-beta.2 <1.3.0` Note that prereleases in
  the `1.2.3` version will be allowed, if they are greater than or
  equal to `beta.2`.  So, `1.2.3-beta.4` would be allowed, but
  `1.2.4-beta.2` would not, because it is a prerelease of a
  different `[major, minor, patch]` tuple.

#### Caret Ranges `^1.2.3` `^0.2.5` `^0.0.4`

Allows changes that do not modify the left-most non-zero element in the
`[major, minor, patch]` tuple.  In other words, this allows patch and
minor updates for versions `1.0.0` and above, patch updates for
versions `0.X >=0.1.0`, and *no* updates for versions `0.0.X`.

Many authors treat a `0.x` version as if the `x` were the major
"breaking-change" indicator.

Caret ranges are ideal when an author may make breaking changes
between `0.2.4` and `0.3.0` releases, which is a common practice.
However, it presumes that there will *not* be breaking changes between
`0.2.4` and `0.2.5`.  It allows for changes that are presumed to be
additive (but non-breaking), according to commonly observed practices.

* `^1.2.3` := `>=1.2.3 <2.0.0`
* `^0.2.3` := `>=0.2.3 <0.3.0`
* `^0.0.3` := `>=0.0.3 <0.0.4`
* `^1.2.3-beta.2` := `>=1.2.3-beta.2 <2.0.0` Note that prereleases in
  the `1.2.3` version will be allowed, if they are greater than or
  equal to `beta.2`.  So, `1.2.3-beta.4` would be allowed, but
  `1.2.4-beta.2` would not, because it is a prerelease of a
  different `[major, minor, patch]` tuple.
* `^0.0.3-beta` := `>=0.0.3-beta <0.0.4`  Note that prereleases in the
  `0.0.3` version *only* will be allowed, if they are greater than or
  equal to `beta`.  So, `0.0.3-pr.2` would be allowed.

When parsing caret ranges, a missing `patch` value desugars to the
number `0`, but will allow flexibility within that value, even if the
major and minor versions are both `0`.

* `^1.2.x` := `>=1.2.0 <2.0.0`
* `^0.0.x` := `>=0.0.0 <0.1.0`
* `^0.0` := `>=0.0.0 <0.1.0`

A missing `minor` and `patch` values will desugar to zero, but also
allow flexibility within those values, even if the major version is
zero.

* `^1.x` := `>=1.0.0 <2.0.0`
* `^0.x` := `>=0.0.0 <1.0.0`

### Range Grammar

Putting all this together, here is a Backus-Naur grammar for ranges,
for the benefit of parser authors:

```bnf
range-set  ::= range ( logical-or range ) *
logical-or ::= ( ' ' ) * '||' ( ' ' ) *
range      ::= hyphen | simple ( ' ' simple ) * | ''
hyphen     ::= partial ' - ' partial
simple     ::= primitive | partial | tilde | caret
primitive  ::= ( '<' | '>' | '>=' | '<=' | '=' ) partial
partial    ::= xr ( '.' xr ( '.' xr qualifier ? )? )?
xr         ::= 'x' | 'X' | '*' | nr
nr         ::= '0' | ['1'-'9'] ( ['0'-'9'] ) *
tilde      ::= '~' partial
caret      ::= '^' partial
qualifier  ::= ( '-' pre )? ( '+' build )?
pre        ::= parts
build      ::= parts
parts      ::= part ( '.' part ) *
part       ::= nr | [-0-9A-Za-z]+
```

## Functions

All methods and classes take a final `options` object argument.  All
options in this object are `false` by default.  The options supported
are:

- `loose`  Be more forgiving about not-quite-valid semver strings.
  (Any resulting output will always be 100% strict compliant, of
  course.)  For backwards compatibility reasons, if the `options`
  argument is a boolean value instead of an object, it is interpreted
  to be the `loose` param.
- `includePrerelease`  Set to suppress the [default
  behavior](https://github.com/npm/node-semver#prerelease-tags) of
  excluding prerelease tagged versions from ranges unless they are
  explicitly opted into.

Strict-mode Comparators and Ranges will be strict about the SemVer
strings that they parse.

* `valid(v)`: Return the parsed version, or null if it's not valid.
* `inc(v, release)`: Return the version incremented by the release
  type (`major`,   `premajor`, `minor`, `preminor`, `patch`,
  `prepatch`, or `prerelease`), or null if it's not valid
  * `premajor` in one call will bump the version up to the next major
    version and down to a prerelease of that major version.
    `preminor`, and `prepatch` work the same way.
  * If called from a non-prerelease version, the `prerelease` will work the
    same as `prepatch`. It increments the patch version, then makes a
    prerelease. If the input version is already a prerelease it simply
    increments it.
* `prerelease(v)`: Returns an array of prerelease components, or null
  if none exist. Example: `prerelease('1.2.3-alpha.1') -> ['alpha', 1]`
* `major(v)`: Return the major version number.
* `minor(v)`: Return the minor version number.
* `patch(v)`: Return the patch version number.
* `intersects(r1, r2, loose)`: Return true if the two supplied ranges
  or comparators intersect.
* `parse(v)`: Attempt to parse a string as a semantic version, returning either
  a `SemVer` object or `null`.

### Comparison

* `gt(v1, v2)`: `v1 > v2`
* `gte(v1, v2)`: `v1 >= v2`
* `lt(v1, v2)`: `v1 < v2`
* `lte(v1, v2)`: `v1 <= v2`
* `eq(v1, v2)`: `v1 == v2` This is true if they're logically equivalent,
  even if they're not the exact same string.  You already know how to
  compare strings.
* `neq(v1, v2)`: `v1 != v2` The opposite of `eq`.
* `cmp(v1, comparator, v2)`: Pass in a comparison string, and it'll call
  the corresponding function above.  `"==="` and `"!=="` do simple
  string comparison, but are included for completeness.  Throws if an
  invalid comparison string is provided.
* `compare(v1, v2)`: Return `0` if `v1 == v2`, or `1` if `v1` is greater, or `-1` if
  `v2` is greater.  Sorts in ascending order if passed to `Array.sort()`.
* `rcompare(v1, v2)`: The reverse of compare.  Sorts an array of versions
  in descending order when passed to `Array.sort()`.
* `compareBuild(v1, v2)`: The same as `compare` but considers `build` when two versions
  are equal.  Sorts in ascending order if passed to `Array.sort()`.
  `v2` is greater.  Sorts in ascending order if passed to `Array.sort()`.
* `diff(v1, v2)`: Returns difference between two versions by the release type
  (`major`, `premajor`, `minor`, `preminor`, `patch`, `prepatch`, or `prerelease`),
  or null if the versions are the same.

### Comparators

* `intersects(comparator)`: Return true if the comparators intersect

### Ranges

* `validRange(range)`: Return the valid range or null if it's not valid
* `satisfies(version, range)`: Return true if the version satisfies the
  range.
* `maxSatisfying(versions, range)`: Return the highest version in the list
  that satisfies the range, or `null` if none of them do.
* `minSatisfying(versions, range)`: Return the lowest version in the list
  that satisfies the range, or `null` if none of them do.
* `minVersion(range)`: Return the lowest version that can possibly match
  the given range.
* `gtr(version, range)`: Return `true` if version is greater than all the
  versions possible in the range.
* `ltr(version, range)`: Return `true` if version is less than all the
  versions possible in the range.
* `outside(version, range, hilo)`: Return true if the version is outside
  the bounds of the range in either the high or low direction.  The
  `hilo` argument must be either the string `'>'` or `'<'`.  (This is
  the function called by `gtr` and `ltr`.)
* `intersects(range)`: Return true if any of the ranges comparators intersect

Note that, since ranges may be non-contiguous, a version might not be
greater than a range, less than a range, *or* satisfy a range!  For
example, the range `1.2 <1.2.9 || >2.0.0` would have a hole from `1.2.9`
until `2.0.0`, so the version `1.2.10` would not be greater than the
range (because `2.0.1` satisfies, which is higher), nor less than the
range (since `1.2.8` satisfies, which is lower), and it also does not
satisfy the range.

If you want to know if a version satisfies or does not satisfy a
range, use the `satisfies(version, range)` function.

### Coercion

* `coerce(version, options)`: Coerces a string to semver if possible

This aims to provide a very forgiving translation of a non-semver string to
semver. It looks for the first digit in a string, and consumes all
remaining characters which satisfy at least a partial semver (e.g., `1`,
`1.2`, `1.2.3`) up to the max permitted length (256 characters).  Longer
versions are simply truncated (`4.6.3.9.2-alpha2` becomes `4.6.3`).  All
surrounding text is simply ignored (`v3.4 replaces v3.3.1` becomes
`3.4.0`).  Only text which lacks digits will fail coercion (`version one`
is not valid).  The maximum  length for any semver component considered for
coercion is 16 characters; longer components will be ignored
(`10000000000000000.4.7.4` becomes `4.7.4`).  The maximum value for any
semver component is `Integer.MAX_SAFE_INTEGER || (2**53 - 1)`; higher value
components are invalid (`9999999999999999.4.7.4` is likely invalid).

If the `options.rtl` flag is set, then `coerce` will return the right-most
coercible tuple that does not share an ending index with a longer coercible
tuple.  For example, `1.2.3.4` will return `2.3.4` in rtl mode, not
`4.0.0`.  `1.2.3/4` will return `4.0.0`, because the `4` is not a part of
any other overlapping SemVer tuple.

### Clean

* `clean(version)`: Clean a string to be a valid semver if possible

This will return a cleaned and trimmed semver version. If the provided version is not valid a null will be returned. This does not work for ranges. 

ex.
* `s.clean(' = v 2.1.5foo')`: `null`
* `s.clean(' = v 2.1.5foo', { loose: true })`: `'2.1.5-foo'`
* `s.clean(' = v 2.1.5-foo')`: `null`
* `s.clean(' = v 2.1.5-foo', { loose: true })`: `'2.1.5-foo'`
* `s.clean('=v2.1.5')`: `'2.1.5'`
* `s.clean('  =v2.1.5')`: `2.1.5`
* `s.clean('      2.1.5   ')`: `'2.1.5'`
* `s.clean('~1.0.0')`: `null`